The interfacial polycondensation of tetrabromobisphenol-a polycarbonate. 2--Reactivities and phase distribution of catalysts
- China Technical Consultants Inc., Miaoli (Taiwan, Province of China). Catalyst Research Center
- National Cheng-Kung Univ., Tainan (Taiwan, Province of China). Dept. of Chemical Engineering
Tetrabromobisphenol-A (TBBPA), a sterically hindered bisphenol, is known to give only low molecular weight polymers using the interfacial process. The low reactivity is attributed to the bulkiness and electron-withdrawing bromine substituents at the ortho positions. The optimum reaction conditions for the interfacial polymerization of TBBPA using pyridine derivatives as a catalyst have been developed. From the two-phase concentration distribution constant (K[sub e]) and p K's values of triethylamine, 4-dimethylaminopyridine (DMAP), and TBBPA, the critical process parameters were obtained. Because of its high nucleophilicity and facile leaving character, the DMAP catalyst system produces a high molecular weight TBBPA-polycarbonate (PC) successfully. The profile of the process was followed to obtain a better understanding of the reaction mechanism.
- OSTI ID:
- 5969049
- Journal Information:
- Journal of Applied Polymer Science; (United States), Journal Name: Journal of Applied Polymer Science; (United States) Vol. 50:1; ISSN 0021-8995; ISSN JAPNAB
- Country of Publication:
- United States
- Language:
- English
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AZINES
CARBON COMPOUNDS
CARBONATES
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
HETEROCYCLIC COMPOUNDS
MEMBRANES
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHASE STUDIES
POLYCARBONATES
POLYMERIZATION
PYRIDINES
SYNTHESIS